Microsoft’s IE11 Preview Bug Bounty has come to a close and the company has revealed that they have paid $28,000 to six researchers for fifteen bugs. Microsoft started the Internet Explorer 11 Preview Bug Bounty in hopes to mitigate any vulnerabilities before the browser is released.

With the upcoming release of Windows 8.1 comes the release of Internet Explorer 11. During the bounty program, Microsoft received several vulnerabilities that qualified for the bounty within the first thirty days.

“We’ve worked with so many bright security researchers through the years, and are thrilled that through the bounty programs, we received reports from researchers who had never reported to us directly before. This means we have even more great minds interested in working directly with us to help make our products more secure,” Microsoft stated in an official blog post.

You can view the winners listed here by name and amount of bounty paid. One of the winners earned a bonus for “finding cool IE design vulnerabilities,” which was not disclosed by the company.

Internet Explorer 11 is set for release along with Windows 8.1 on October 18th.